It will be fine, but it's not essential.
Another appreciated function will be to add un scheduler, for exemple to synchronyse on the air every 30 minutes or one hour (connection and disconection inclued)

Hey, thanks for offering help. After reinstallling the program, the event sync worked. My contact sync broke down previously with an "unexpected error", but this could be fixed by deleting all contacts (>200) on my mobile device. Now I will try around to see if the content also looks good.